Method, equipment and network device for controlling power

ES 2 552 801 T3

DESCRIPTION

Network method, apparatus and device for power control

FIELD OF THE INVENTION

The present invention relates to the field of communication technologies, and in particular to a method, an apparatus and a network device for power control.

BACKGROUND OF THE INVENTION

In a Long-Term Evolution (LTE) system, generally a User Equipment (UE) communicates with only one Access Point (AP) in an uplink direction (i.e. UE sends a signal to the AP) and in a downlink direction (i.e. the AP sends signals to the UE) in which the AP is called a serving AP, and an uplink serving AP and a serving AP downlink is the same AP. The AP is a node that includes at least one radio frequency transceiver and may be equipped with one or more antenna elements, multiple APs may be geographically distributed or centralized and connected to an eNodeB over a wired or wireless connection, or the AP and the eNodeB can be the same physical entity. The relationship between an AP and a cell can be: A cell includes one AP, or a cell includes multiple APs. For ease of description, the following assumes that a cell includes an AP. In such a system, the uplink transmission power of the UE (User Equipment) may be based on downlink signaling from the base station eNodeB and / or the measurement result of a radio channel measured by the UE. For example, the transmit power of a UE Physical Uplink Share Channel (PUSCH) is decided by multiple factors, including downlink Path Loss (abbreviated as PL) measured by the UE, cell-specific power Po_norminal_puschCÍ) sent by the AP to the UE, and UE-specific power setting Po_ue_puschO) sent by the AP to the UE. Therefore, the UE receives the downlink signaling sent by the serving AP to obtain Po_norminal_puschO) and Po_ue_puschO), measures the downlink signal sent by the serving AP to obtain the PL, and calculates the transmission power value of uplink considering other parameters.

In the process of implementing the present invention, the inventor finds that: In the communication system, the introduction of multiple technologies, such as Coordinated Multi-Point Transmission (CoMP), different uplink and downlink service cells, and retransmission, henceforth lead to a new scenario. For example, CoMP technology is an important way to improve the overall throughput of a cell and the throughput of the cell serving a UE at the edge of the cell, and multiple APs can coordinate the transmission and reception of data from the cell. UE (APs can be connected to the same eNodeB or to different base stations) and therefore a new scenario can be introduced, that is, the uplink and downlink service APs can be the same or different. If the existing uplink power control algorithm is applied directly, a certain problem may occur during the uplink power control. Specifically, among parameters of the uplink power control formula, cell-specific parameters (such as the Po_norminal_puschO value) and UE-specific parameters (such as the Po_ue_puschO value) are obtained by the UE from an AP that sends downlink signaling; if the AP is different from the uplink service AP of the UE, the uplink signal power obtained according to the parameters does not correspond to the power expected by the uplink service AP. Furthermore, among the parameters of the uplink power control formula, the PL is obtained by the UE by measuring downlink signals from an AP; if the AP is different from the uplink service AP of the UE, the uplink signal power obtained according to the parameter of PL does not correspond to the power expected by the uplink service AP.

Document D1 is WO 2008/100954 A2. On page 15 and in fig. 6, D1 describes that the UE may receive a first TPC command from a DL serving cell for the UE (block 612). The UE may also receive a second TPC command from a UL serving cell for the UE, the DL and UL serving cells being different cells (block 614). The DL serving cell may have the best downlink for the UE, and the UL serving cell may have the best uplink for the UE. The UE can adjust its transmit power based on the first and second TPC commands and according to an OR rule of the Up (block 616). For block 616, the UE can increase the transmit power and can decrease its transmit power if the first and second TPC commands both direct a decrease in the transmit power.

Document D2 is WO 03/096572 A2. On pages 2-4 and 5 and in figs. 3 and 4, D2 describes a method for deriving power control information by a mobile unit from a serving base station. The method includes that the mobile unit receives a plurality of messages from the serving base station over a first reverse link, where each of the plurality of messages includes power control information and the mobile unit is coupled to the base station of service through a second reverse link. The method also includes an operation of setting the power control information of the second reverse link equal to the power control information of the first reverse link, after determining that a ratio of the power of the first reverse link to the power of the second reverse link it is not greater than a first predetermined threshold.

ES 2 552 801 T3

Document D3 is WO 2007/149616 A2. On page 16, operations 516 and 518, and in FIG. 5, of D3, it has been described that Node B can relay the adaptive power control parameter to UEs served by Node B. Node B can further determine a path loss threshold, i.e. a path loss of a UE whose path loss is at percentage level X, which informs each UE served by node B of the loss threshold path by relaying the path loss threshold to the UEs. In response to receiving the percentage level X and the adaptive power control parameter, each UE can store the parameters in at least one memory device of the UE and then determine for itself the fractional path loss and a transmit power. uplink based on downlink channel conditions measured by the UE and the stored path loss threshold and adaptive power control parameter.

Document D4 is Project of Association of 3^to Generation 3GPP TS 36.213 V8.6.0 (2009-03); Radio Group Access Network Technical Specification; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (version 8). D4 describes, on page 9-11 and 12, that the UE transmission power setting for the transmission of the physical uplink shared channel (PUSCH) in subframe i is defined by parameters that include the transmission power of Configured UE, the bandwidth of the PUSCH resource allocation expressed in number of valid resource blocks for subframe i, a parameter composed of the sum of a cell-specific nominal component and a UE-specific component, and the estimated downlink path loss calculated at the UE.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method, apparatus, and network device for power control for ensuring uplink transmission through corresponding processing when an AP sending downlink signaling to a UE is different from an AP from UE service uplink.

To achieve the objective of the present invention, the present invention is implemented using the technical solutions as defined in the independent claims. Other embodiments are defined in the dependent claims.

Using the method, apparatus and network device for power control provided by embodiments of the present invention, when the AP sending downlink signaling to the UE is different from the uplink service AP of the UE, a corresponding treatment is performed to ensure that the calculated uplink transmission power corresponds to the expected uplink transmission power for uplink transmission, and thereby a normal uplink transmission is ensured.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of situation 1 of scenario 1 according to a first example.

Fig. 2 is a schematic diagram of situation 2 of scenario 1 according to the first example.

Fig. 3 is a schematic diagram of situation 1 of scenario 2 according to the first example.

Fig. 4 is a schematic diagram of situation 2 of scenario 2 according to the first example.

Fig. 5 is a schematic diagram of situation 3 of scenario 2 according to a first example.

Fig. 6 is a schematic structural diagram of an apparatus for power control according to a second embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a UE according to a fourth example.

DETAILED DESCRIPTION OF THE REALIZATIONS

Embodiments of the present invention provide a method and apparatus for power control to ensure normal uplink transmission through corresponding processing when an AP sending downlink signaling to a UE is different from a UE uplink service AP . To better explain the purpose, technical solutions, and advantages of the present invention, the following describes embodiments of the present invention in detail with reference to the accompanying drawings. It should be noted that an LTE system is taken as an example and is not construed as a limitation to the present invention. Those skilled in the art can understand that the present invention can also be applied to other topics or networks. The serving AP in embodiments of the present invention includes an uplink serving AP and a downlink serving AP. In addition, what has been described in the first and second embodiments of the present invention should be highlighted. The first, second, third and fourth examples are used only for a better understanding of the present invention, which is described in the first and second embodiments.

Example 1

ES 2 552 801 T3

When an AP sending downlink signaling to a UE is different from the uplink service AP of the Ue, an eNodeB obtains parameters from one or some or all of the uplink service APs, where the parameter includes at least one of the following parameters:

1. PL between the uplink service AP and the UE as measured by the uplink service AP, where the PL can be obtained by the uplink service AP that detects an uplink signal sent by the UE and performs the calculation;

two. a cell specific parameter of the uplink service AP, for example Po_norminal_puschO) indicating an expected received power value, the parameter c (j) indicating the control of interference to other cells and the parameter Ks indicating whether to adjust the power of according to an MCS in an LTE system; Y

3. a UE specific parameter determined by the uplink service AP. It should be noted that the uplink service AP determines the parameters according to its own planning and resources; The UE specific means that the parameters can be different for different UEs, because the parameters are determined by the eNodeB or AP according to the planning and resources of the eNodeB or Ap. An example of such parameters is Po_ue_puschO) which indicates that the UE is expected to control interference to other cells in the LTE system.

The eNodeB then calculates an uplink transmission power adjustment value of the UE according to the obtained parameters, and transfers the uplink transmission power adjustment value to the UE via downlink signaling, after receive the downlink signaling, the UE maps according to a corresponding mode, and adjusts the uplink power after obtaining the uplink transmit power adjustment value.

The eNodeB calculates the uplink transmission power adjustment value according to the parameters obtained, which can be one of the corresponding parameters obtained from all the uplink service APs, or be the maximum value, or minimum value, or mean value of the corresponding parameters obtained from all the uplink service APs.

The above process can be performed when the uplink and / or downlink service AP of the UE changes. The eNodeB can get the parameters of the uplink service AP through different connections between the eNodeB and the AP such as a fiber connection, when the uplink service AP of the UE is connected to different eNodeB, the parameters can also be transferred through connections between eNodeBs, for example, transferred through an X2 interface.

Also, the relationship between the uplink transmit power setting value and the downlink signaling can be as follows: The downlink signaling may directly influence the power adjustment value information, or the power adjustment value information is implicitly included in other downlink signaling and transferred to the UE, i.e. higher layer signaling (for example, higher layer signaling in the LTE system) or power control signaling may be used in the prior art. The signaling can be transferred to the UE through a relay channel as a downlink control channel.

Furthermore, the eNodeB can transfer the downlink signaling to the UE directly, or the eNodeB first transfers the signaling to the AP and then the signaling is transferred to the UE through the AP.

For ease of description, the following describes a situation where one eNodeB is connected to two APs and one UE is served by at most two APs as an example.

Scenario 1: The uplink service AP and the downlink service AP is the same AP.

The eNodeB is connected to AP 1 and AP 2, and the uplink and downlink service APs of the UE are the same AP. Fig. 1 shows a situation where only AP 1 serves the UE, and in this case, good performance can be achieved by the prior art. Fig. two shows a situation where both AP 1 and AP 2 serve the UE, and in this case, if the prior art has been used, i.e. the UE receives downlink signaling only from AP 1, marked as signaling downlink data (including power control information Po_norminal_puschO) and Po_ue_puschO information) of AP 1) in FIG. 1B, and detects only the PL from AP 1 to the UE to calculate the uplink transmission power of the UE, the uplink signal sent by the UE arrives at AP 1 at the power expected by AP 1; However, because the power control information from AP 1 differs from the power control information from AP 2, and the PL from the UE to AP 1 also differs from the PL from the UE to AP 2, the power Uplink transmission rate of the UE sending the uplink signal to AP 2 is too high or too low. Therefore, the prior art cannot work normally in this scenario. The technical solutions of the present invention can be well implemented, and specifically, the following operations can be performed:

1. AP 1 detects the uplink PL between AP 1 and the UE, and AP 2 detects the uplink PL between AP 2 and 4

ES 2 552 801 T3 the UE, respectively.

two. AP 1 transfers the uplink PL between AP 1 and the UE, and parameters related to the uplink power control to the eNodeB, and AP 2 transfers the uplink PL between AP 2 and the UE and parameters related to the control of uplink power to the eNodeB, where the parameters related to the power control may include at least one of the following contents.

(1) expected received power value of the signal from the UE received by AP 1 and AP 2, where the value includes at least one of a cell-specific parameter and a UE-specific parameter but is not limited to the previous parameter, or is the value obtained by calculating through the use of the cell-specific parameter and the UE-specific parameter, in particular, functions of these parameters, and the present invention does not limit the calculation method.

(2) Compensation coefficient to compensate for PLs when AP 1 and AP 2 expect the UE to perform power control, where the value can be a real number in the range 0-1, and the value 1 indicates the full compensation for the PLs, and (3) if an MCS is considered to adjust the uplink transmit power when AP 1 and AP 2 wait for the UE to perform power control. For different cells, when Ks is set to different values, the uplink transmit power settings are different. For example, for cell 1, if KS = 0, it indicates that the uplink transmit power is not adjusted, for cell 2, if KS = 1.25, it indicates that the uplink transmit power adjustment is 10log10 (2MPR (i) KS-1), where MPR indicates the number of bits transmitted per symbol when an MCS is used. Therefore, when AP 1 and AP 2 wait for the UE to perform power control, the uplink transmission power can be adjusted according to different Ks values ​​(for example, the function of different Ks values) of cell 1 and cell 2.

3. After receiving the parameter information, the eNodeB can determine the UE power control parameter according to the parameters of AP 1 and AP 2, for example:

(1) Obtain the average value of the expected received power values ​​of the uplink signals that AP 1 and AP 2 receive, and use the obtained average value as the power control parameter.

(2) obtain the average value of offsets for the PLs when AP 1 and AP 2 wait for the UE to perform power control, and use the average value obtained as the power control parameter; and (3) if either AP 1 or AP 2 expect the UE to adjust the transmission power considering the MCS, determine that the UE adjusts the transmission power considering the MCS, and generate corresponding parameter information, where the method of adjusting the transmission power considering the MCS has already been described above and will not be described further here.

Four. The eNodeB sends the above parameters to the UE via downlink signaling.

5. After receiving the downlink signaling, the UE analyzes the signaling and adjusts the uplink transmission power according to the result of the analysis.

Scenario 2: The uplink service AP is different from the downlink service AP.

The eNodeB is connected to AP 1 and AP 2, because the transmit power and antenna configuration of the APs are different, and the uplink / downlink channel fading between the UE and the APs is varied, the Uplink service AP can be different from downlink service AP. For example, the transmission power of an AP is higher than that of the UE, and therefore, the signal sent by the AP can be recovered normally by the UE but the signal sent by the UE cannot be recovered normally by the AP. In this case, the downlink service AP of the UE may be more than the uplink service AP of the UE. Furthermore, the situation may make the AP sending downlink signaling to the UE different from the uplink service AP of the UE.

Scenario 2 shows three of the situations. In fig. 3, the downlink service AP of the UE is AP 1; in this case, if the prior art has been used, and the UE receives downlink signaling (including power control information Po_norminal_puschO) and Po_ue_puschO information) from AP 1) from AP 1, and detects only the PL from AP 1 to the UE, however, the uplink service AP is AP 2, because the power control information of AP 1 differs from the power control information of AP 2 and the PL of AP 1 also differs from the PL of AP 2, the uplink transmit power of the UE sending the uplink signal to AP 2 is too high or too low. The technical solutions of the present invention can be well implemented, and specifically, the following operations can be performed:

1. AP 2 detects the uplink PL to the UE.

two. AP 2 transfers the PL and the parameters related to the uplink power control to the eNodeB, in

ES 2 552 801 T3 that the parameters related to power control may include at least one of the following contents:

(1) the expected received power value of the signal from the UE receiving AP 2, where the value includes at least one of the cell-specific parameters and one UE-specific parameter but is not limited to the parameters, or is the value obtained by calculating through using the cell-specific parameters and the UE-specific parameters, in particular, functions of these parameters, and the present invention does not limit the calculation method.

(2) compensation coefficient to compensate for PLs when AP 2 expects the UE to perform power control, where the value can be a real number in the range 0-1, and the value 1 indicates the full compensation for the Pl, and (3) whether an MCS is considered to adjust the uplink transmission power when AP 2 expects the UE to perform power control. For different cells, when Ks is set to different values, the uplink transmit power settings are different. For example, for cell 1, if KS = 0, it indicates that the uplink transmit power is not adjusted, for cell 2, if KS = 1.25, it indicates that the uplink transmit power adjustment is 10log10 (2MPR (i) KS-1), where MPR indicates the number of bits transmitted per symbol when an MCS is used. Therefore, when AP 1 and AP 2 wait for the UE to perform power control, the uplink transmission power can be adjusted according to different Ks values ​​(for example, the function of different Ks values) of cell 1 and cell 2.

3. After receiving the parameter information, the eNodeB can determine the UE uplink power control parameter according to the parameters included in the information

Four. The eNodeB sends the above parameters to the UE via downlink signaling.

5. After receiving the downlink signaling, the UE analyzes the signaling and adjusts the uplink transmission power according to the result of the analysis.

In Figure 4, the downlink service APs of the UE are AP 1 and AP 2, and the uplink service AP is AP 2; in this case, if the prior art has been used, that is, the UE receives downlink signaling from AP 1, and detects only the PL from AP 1 to the UE, due to the same cause, the link transmission power The uplink of the UE sending the uplink signal to AP 2 is too high or too low. The technical solutions of the present invention can be well implemented, and specifically, the following operations can be performed:

1. AP 2 detects the uplink PL to the UE.

two. AP 2 transfers the PL and the parameters related to the uplink power control to the eNodeB, where the parameters related to the power control may include at least one of the following contents:

(1) the expected received power value of the signal from the UE receiving AP 2, where the value includes at least one of the cell-specific parameters and one UE-specific parameter but is not limited to the parameters, or is the value obtained by calculating through using the cell-specific parameters and the UE-specific parameters, in particular, functions of these parameters, and the present invention does not limit the calculation method.

(2) Compensation coefficient to compensate for PL when AP 2 expects UE to perform power control, where the value can be a real number in the range 0-1, and the value 1 indicates full compensation for Pl, and (3) whether an MCS is considered to adjust the uplink transmit power when AP 2 expects the UE to perform power control. For different cells, when Ks is set to different values, the uplink transmit power settings are different. For example, for cell 1, if KS = 0, it indicates that the uplink transmit power is not adjusted, for cell 2, if KS = 1.25, it indicates that the uplink transmit power adjustment is 10log10 (2MPR (i) KS-1), where MPR indicates the number of bits transmitted per symbol when an MCS is used. Therefore, when AP 1 and AP 2 wait for the UE to perform power control, the uplink transmission power can be adjusted according to different Ks values ​​(for example, the function of different Ks values) of cell 1 and cell 2.

3. After receiving the parameter information, the eNodeB can determine the uplink power control parameters of the UE according to the parameters of AP 2

Four. The eNodeB sends the above parameters to the UE via downlink signaling.

5. After receiving the downlink signaling, the UE analyzes the signaling and adjusts the uplink transmission power according to the result of the analysis.

In fig. 5, the downlink service AP of the UE is only AP 1, and the downlink signaling is sent to the UE through AP 1, but the uplink service APs are AP 1 and AP 2, in this case , the uplink power control can be performed according to the following operations:

ES 2 552 801 T3

1. AP 1 and AP 2 detect the PLs uplink to the UE.

two. AP 1 and AP 2 transfer the PLs and the parameters related to the uplink power control to the eNodeB, where the parameters related to the power control may include at least one of the following contents:

(1) the expected received power value of the signal from the UE that AP 1 and AP 2 receive, where the value includes at least one of the cell-specific parameters and one UE-specific parameter but is not limited to the parameters, o is the value obtained by calculating through using the cell-specific parameters and the UE-specific parameters, in particular, functions of these parameters, and the present invention does not limit the calculation method.

(2) the compensation coefficient to compensate the PLs when AP 1 and AP 2 expect the UE to perform power control, where the value can be a real number in the range 0-1, and the value 1 indicates the complete compensation for PLs, and (3) if an MCS is considered to adjust the uplink transmit power when AP 1 and AP 2 wait for the UE to perform power control. For different cells, when Ks is set to different values, the uplink transmit power settings are different. For example, for cell 1, if KS = 0, it indicates that the uplink transmit power is not adjusted, for cell 2, if KS = 1.25, it indicates that the uplink transmit power adjustment is 10log10 (2MPR (i) KS-1), where MPR indicates the number of bits transmitted per symbol when an MCS is used. Therefore, when AP 1 and AP 2 wait for the UE to perform power control, the uplink transmission power can be adjusted according to different Ks values ​​(for example, the function of different Ks values) of cell 1 and cell 2.

3. After receiving the parameter information, the eNodeB can determine the UE power control parameters according to the parameters of AP 1 and AP 2, for example:

(1) Obtain the average value of the expected received power values ​​of the uplink signals that AP 1 and AP 2 receive, and use the obtained average value as the power control parameter.

(2) obtain the average value of offsets for the PLs when AP 1 and AP 2 wait for the UE to perform power control, and use the average value obtained as the power control parameter; and (3) if either AP 1 or AP 2 expect the UE to adjust the transmit power considering the MCS, determine that the UE adjusts the transmit power considering the mCs, and generate corresponding parameter information.

Four. The eNodeB sends the above parameters to the UE via downlink signaling.

5. After receiving the downlink signaling, the UE maps the signaling and adjusts the uplink transmission power according to the result of the mapping.

In the first example, when the AP sending downlink signaling to the UE is different from the uplink service AP of the UE, a corresponding treatment is performed to ensure that the calculated uplink transmission power corresponds to the transmission power. expected uplink for uplink transmission, thereby ensuring normal uplink transmission.

Embodiment 1

In the first embodiment of the present invention, a special treatment has been performed on the adjustment of a PL based on the first example. That is, when an AP that sends a first downlink signaling to a UE is different from an uplink service AP of the UE, the eNodeB may also notify the UE through a second downlink signaling (metering indicator of PL) to detect the PLs of one or some or all of the uplink service APs. After receiving the signaling, the UE detects the PL of the uplink service AP and applies the PL in the uplink power control. For example, if the eNodeB notifies the UE to detect the PL of an AP, the UE detects the PL and then calculates the transmit power according to the compensation coefficient reported by the eNodeB, if the eNodeB notifies the UE to detect the PL of multiple APs, the UE can detect multiple PLs, and then calculate the transmit power according to the compensation coefficient reported by the eNodeB. The present invention does not limit the calculation method. For a cell specific parameter of an uplink service AP and a UE specific parameter determined by the uplink service AP, for example, Po_ue_puschO) indicating that the UE is expected to control interference to other cells in the LTE system, see the process of the first example. No details have been described here.

The downlink signaling includes an uplink service AP ID or information indicating the uplink service AP ID. According to the ID of the uplink service AP or the information indicating the ID of the uplink service AP, the UE can know if a downlink signal has been sent by the service AP so as to analyze the downlink signaling, or detect the downlink signal to get an uplink PL.

ES 2 552 801 T3

In the first embodiment of the present invention, when the AP sending downlink signaling to the UE is different from the uplink service AP of the UE, a corresponding treatment is performed to ensure that the calculated uplink transmission power corresponds to the Expected uplink transmission power for uplink transmission, thereby ensuring normal uplink transmission.

Example 2

In this example, the change information of a serving AP of a UE is limited to a value range of an uplink power control parameter based on the first example. That is, when an uplink and / or downlink serving AP of the UE changes, an eNodeB can notify the UE of the change information of the serving AP through downlink signaling; the eNodeB may also send downlink power control signaling to the UE. After receiving the change information from the serving AP, the UE maps the change information to a range modification of the uplink power control parameter carried in the downlink signaling; After the UE receives the downlink power control signaling, the UE analyzes the downlink power control signaling according to a new value range of the power control parameter and thereby adjusts the link power upward.

For example, when the uplink service AP does not change, the uplink power control parameter range is [-A, B], where -A indicates the minimum value of a power setting and B indicates the value maximum of the power setting and the unit can be dB. The range of the value of the uplink power control parameter can also be actual values. For example, in an LTE system, the DCI format range is [-1, 0, 1, 3] dB, indicating that one of the four power settings can be selected. When the number of the uplink service APs increases, the eNodeB notifies the UE through the downlink signaling, and after the UE knows that the number of the uplink service APs increases, the UE does correspond the value range of the uplink power control parameter to [-C, D] according to the increase of the uplink service APs. When the number of the uplink service APs decreases, the eNodeB notifies the UE through the downlink signaling, and after the UE knows that the number of the uplink service APs decreases, the UE does correspond the value range of the uplink power control parameter to [-E, F] according to the decrease of the uplink service APs. After receiving the downlink power control signaling, the UE can match the downlink power control signaling according to a new value range of the uplink power control parameter to adjust the link power upward.

In the second example, when the AP sending downlink signaling to the UE is different from the uplink service AP of the UE, corresponding processing is performed to ensure that the calculated uplink transmission power corresponds to the power of expected uplink transmission, thereby ensuring normal uplink transmission.

Example 3

When an uplink and / or downlink service AP of a UE changes, an eNodeB can notify the UE with priority that the uplink service AP changes; After receiving the information, the UE can automatically adjust the uplink transmission power. For example, when the number of the uplink service APs increases, the eNodeB notifies the UE through the downlink signaling, and after knowing the increase of the uplink service APs, the UE automatically decreases the uplink transmit power value; When the number of the uplink service APs decreases, the eNodeB notifies the UE through the downlink signaling, and after the UE knows the decrease of the uplink service APs, the UE automatically increases the uplink transmit power value.

The eNodeB may notify the UE of the change information of the serving APs in the following way. The downlink signaling includes the change information directly, or the change information is implicitly included in other downlink signaling and transferred to the UE. The uplink transmission power value adjusted automatically by the UE can be notified to the UE through the downlink signaling in advance.

The uplink transmit power setting value can be transferred by the eNodeB to the UE through multiple power control signaling pieces, and after receiving the multiple control signaling pieces, the UE executes indicators of the entire power control signaling. The power setting range can be extended using this method, therefore the prior art power control method can be used to support examples.

For example, in an LTE system, the uplink power control indicators can be transferred using a DCI format 0 (Downlink Control Indicator, DCI) (the value range is [-4, -1, 1 , 4] dB)

ES 2 552 801 T3 and DCI format 3 (the value range is [-1, 0, 1, 3] dB), so if the uplink power control setting value is 7 dB, a uplink power control indicator using DCI format 0 indicating that the power setting is 4 dB and an uplink power control indicator using DCI format 3 indicating that the power setting is 4 dB. 3 dB can be transferred simultaneously. After receiving the two indicators, the UE can adjust the uplink transmit power by 7 dB.

In the third example, when the AP sending the downlink signaling to the UE is different from the uplink service AP of the UE, a corresponding treatment is performed to ensure that the calculated uplink transmission power corresponds to the power of expected uplink transmission for uplink transmission, thereby ensuring normal uplink transmission. Also, the third example can extend the power control range and ensure the uplink transmission performance when the uplink service AP changes.

Those skilled in the art should understand that all or part of the method operations in any embodiment of the present invention may be implemented by a program that instructs relevant hardware. The program can be stored on a computer-readable storage medium such as a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or a Compact Disk-Read Only Memory (CD-ROM). ).

Fig. 6 is a schematic structural diagram of an apparatus for power control according to the second embodiment of the present invention, the power control apparatus includes a unit 610 for judging and a unit 620 for sending, in which:

the judging unit 610 is configured to judge whether an uplink service AP of a UE and an uplink service AP of the UE are the same AP; and the sending unit 620 is configured to send downlink signaling to the UE when the judging unit 610 determines that the downlink service AP of the UE is different from the uplink service AP of the UE, so that the UE Adjust the uplink transmit power according to the downlink signaling.

It should be noted that the sending unit 620 is further configured to send at least one of the parameters obtained from the obtaining unit and the UE specific parameter determined by the uplink service, and a PL measurement indicator to the UE carrying the indicator parameter in downlink signaling. The downlink signaling further includes an uplink service AP ID with information indicating the uplink service AP ID.

The embodiment of the apparatus for power sensing can be applied in related network devices, and the structure of the apparatus is described above and will not be described further here.

Fig. 7 is a schematic structural diagram of a UE according to the fourth example. The UE includes a first receiver unit 710, a unit 720 for measuring, a second unit 730 for calculating, and a first unit 740 for adjusting; in what:

the first receiver unit 710 is configured to receive a PL measurement indicator and a parameter sent by a base station; the measurement unit 720 is configured to measure a PL between the UE and at least one uplink service AP of the UE according to the PL measurement indicator received by the first receiver unit 710;

the second calculating unit 730 is configured to calculate an uplink transmit power setting value in accordance with the measured PL and parameters obtained from the base station, ^Y the first adjusting unit 740 is configured to adjust the uplink transmit power according to the uplink transmit power adjustment value calculated by the second unit 730 to calculate.

It should be noted that the present invention is also applicable to a relay system (i.e. the AP here can be replaced by a relay node) or other systems in which an uplink power control parameter does not correspond to the transmission. uplink.

A method and apparatus for power control provided by the present invention have been detailed above. Although the principle and implementation of the present invention are described with reference to embodiments, the embodiments are only intended to aid in understanding the solutions of the present invention.